docs: def logout_allowed(service):
      """Check if a given service identifier should be sent a logout request."""
      if hasattr(settings, 'MAMA_CAS_SERVICES'):
          return _is_allowed('logout_allowed', service)
  
      if hasattr(settings, 'MAMA_CAS_ENABLE_SINGLE_SIGN_OUT'):
          warnings.warn(
              'The MAMA_CAS_ENABLE_SINGLE_SIGN_OUT setting is deprecated. SLO '
              'should be configured using MAMA_CAS_SERVICES.', DeprecationWarning)
      return getattr(settings, 'MAMA_CAS_ENABLE_SINGLE_SIGN_OUT', False)